The Prime Minister has made a "compelling argument" for a bombing campaign against Islamic State targets in Syria, former Labour Home Secretary Alan Johnson has said.
Speaking to ITV News, Mr Johnson said that whilst he hadn't yet decided if he would vote for airstrikes and that there was widespread agreement in the House of Commons that something must be done about IS.
"He (Cameron) needs to do more about what happens next in terms of ground forces - and that's a concern I think right across the house," Johnson said.
David Cameron has revealed he will "make the case" for Britain to join its allies in tackling Islamic State in Syria, instead of just Iraq.
The Chancellor has said the government will only call a vote on UK military action in Syria when it is "confident that we are going to win".
Labour's shadow chancellor has said the notion of any UK intervention in the Syria conflict has to be looked at in a "very considered way".